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They changed the valve seat material a couple of times too over the years, so the latest heads will have the best seats for modern unleaded, ethanol fuel. The early ones may need upgrading. I can probab'y find out when if needed.
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 Roast Beef Monster!
Termignoni and Bucci - Italian for pipe and slippers! 
S4 Fogarty, S4R 07T, 748, Series 1 Mirage
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